Packaging machine



T. C. POTTER ETAL PACKAGING MACHINE Aug. 27, 1968 6 Sheets-Sheet 1 Aug. 27, 1968 T. c. POTTER ET Al.4 3,398,675

PACKAGING MACHINE Filed April 2o, 196e 6 SheletsfSheet 2 Aug. 27, 1968 T Q PQTTER ET AL PACKAGLNG MACHINE 6 Sheets-Sheet 5 Filed April 20, 1966 m-s=n--=m NN ..IIT l l IIT/ llll .IILII O NN .1-- -L Hlwlnuwmf P. rfr 2 IHMHVIIIHIW.. @N QN S H.. mvv ahw; ambi? m5 wm. 4r.. :Il ww @mw LN; www. nl NN G n www. mN N $3 @QN .1.\ n.5 q.. -lwlllulllm lll llt I l l l s .i uv z Jn'. GNN. @mw

T. c. POTTER l-:TAL 3,398,675

PACKAGING MACHINE 6 Sheets-Sheet 4 Aug. 27, 196s Filed April 20, 1966 Aug. 27, 1968 T. c. POTTER ETAL 'lleci Aprll 20,

ug' 27, 1958 T. c. POTTER ETAL 3,398,675

PACKAGING MACHINE 6 Sheets-Sheet 6 www mw Filed April 20, 1966 United States atent C 3,398,675 PACKAGING MACHINE Thomas C. Potter, Park Forest, and George H. Burt,

Mokena, Ill., assignors to Interlake Steel Corporation, Chicago, Ill., a corporation of New York Filed Apr. 20, 1966, Ser. No. 543,958 5 Claims. (Cl. 100,-7)

ABSTRACT OF THE DISCLOSURE A machine for packaging loose stacks of articles. The stacks are compacted by improved powered compac'ting means. Improved jig stacking devices are included for minimizing damage to the articles and to the machine.

This invention relates to the art of stacking articles, such as bricks', in preparation for strapping the articles into bound unitized stacks.

With increased labor costs, great effort has been directed toward improving means for handling construction materials in order to lower these costs. Large quantities of bricks are used in construction work and much of this effort has been directed toward improving their handling. Although the invention, as described herein, has particular advantages for handling bricks, it is sufficiently versatile that it can be employed for handling of other types of identical or similar articles which are so shaped that they can be arranged into orderly stacks.

Whereas, in previous years, it was comrnon to handle bricks, and the like, in bulk, it has been learned that there are many disadvantages with bulk handling and they have been substantially overcome by using a unit pack of bricks stacked in abutting parallel rows and encircled with a loop of strap tensioned tightly to retain the bricks as a unit. Method and apparatus for providing such unit packs of bricks is shown and described in U.S. Patent 3,003,296 issued Oct. 19, 1961, to John G. Felkamp et al. Such a similar arrangement is also shown in a second U.S. Patent 3,095,678 issued July 2, 1963, to G. I. Clifrr et al. In this second patent is shown and described a stacking machine Iwhich is employed for proper arrangement of the bricks in stacks which are then shifted by movement on jigs to a strapping station on the machine. There the stacks are individually pushed 0H the jigs by means of an ejector mechanism; then they move to a compacting station and finally to the strapping station where loops of strap are applied around the individual stacks. As they pass through the strapping station, flexible c'orner protector straps are applied thereto and the finished unit packs of bricks are subsequently removed from the end of the strapping station.

fWith the apparatus of the type shown in U.S. Patent 3,095,678, applicants have observed problems when employing the jigs used for stacking. They are provided with horizontal slats as the backing means against which the bricks are positioned as they are manually stacked therein. The slats are spaced virtically from each other to insure that all bricks of the stack being formed in a jig bear, at least in part, against at least one of the slats. This is intended to insure straight alignment of the bricks without any overhang of any of them relative to others in each stack. Certain diiculty has been encountered because of variations in the sizes of bricks to be stacked which do not correspond to the spacbing of the slats in a jig. In such a situation, certain rows of the bricks may not have any backing support from any of the slats. They then overhang other of the bricks and align unevenly. With overhang of the bricks, they can interfere with structural portions of the machine or misalign with the ejector mecha- 'ice nism which pushes the stacks from the jibs toward the strapping station. Any interference in this manner can cause serious jamming and damage to the machine.

Just as the spacing of the slats in the jigs relative to the size of the bricks being stacked presents uneven brick alignment possibilities, the ejector mechanism is provided with slats which are positioned to pass between the slats on the jigs to effectuate proper bricks stack ejection. If the slats on the ejector miss contact with any rows of the bricks, it is possible that a level of bricks can be left onthe jig. This can have the effect of interfering lwith the return movement of the ejector and also cause jamming or severe damage to the machine.

Aside from the damage possibilities, unevenly aligned bricks create further difficulties. When the stacks are forced one against the other, projecting bricks of adjacent stacks can overlap and interlock each other to present difficulties when later trying to separate one strapped stack 'from another after they are strapped.

It is an important object of this invention to provide an improved stacking arrangement for the jigs which insures good alignment of the bricks with minimum chance of overhang of any of the bricks relative to others in a stack.

lIt is still another object of the invention to provide an improved ejector arran-gement for ejecting thestacks of bricks from the jig toward the strapping station, such that ejection of all the bricks in a stack is insured and with minimum chance of misaligning the bricks.

In equipment of the type shown in the Patent 3,095,678 referred to, at the compression station following the ejection location and ahead of the strapping station, spring loaded fingers are positioned along a vertical wall. These fingers are urged in a direction toward the location of brick stacks passing through the station and their spring pressure urges alignment of the bricks, both laterally and longitudinally. Their Iforce compacts the bricks laterally by urging them against a stationary Wall on the opposite side of the location of the fingers, while the longitudinal compacting of the bricks occurs because of the frictional -dra-g of the fingers and the stationary Wall as the stacks are urged toward the strapping station. The limit of adjustment of the .lingers is through their individual adjustment of spring pressure and it is very common to have different size stacks of bricks transported through this compression station. If the brick stacks are smaller than what the spring fingers are adjusted for, they `do not provide sufficient compression force to adequately compact and align the bricks into stacks. The operator, in order to `correct for the small brick package size, must yadjust the spring iingers individually. Experience indicates that the operator generally does not make the adjustments because of the lar-ge number of fin-gers to adjust and the long down time of the machine necessary to accomplish this adjustment. 11n order to overcome this problem, this invention contemplates the improvement of employing retractable power operated movement to the wall containing the spring fingers so that uniform pressure can be applied by means of the power means to urge all of the spring fingers against the brick stacks regardless of Whether or not the stacks are wide or narrow.

Also the prior art type spring fingers rub on the sides of the brick stacks and mar and damage the bricks. In addition, if the stacks are misaligned laterally of each other so that the edge of one stack is laterally displaced relative to the edge of an adjacent stack, the fingers snap against one or the other of the stacks as they shift from one stack to the other with the result that chipping of the bricks occurs. It is still another object of the invention to improve the finger construction by the addition of rollers at their ends. This enables the laterally aligned brick stacks to pass the spring ngers by a rolling action of the spring ingers from one stack to another without any harmful snapping movement of the fingers.

Another object of the invention is to provide a pressure device for the spring lingers which presents a force measuring means so that the operator can pre-set the pressure to a known force. By this means, a force level can be pre-set with the proper compression to insure adequate compacting of the brick stacks. If only the spring adjustment of individual spring fingers is relied upon, as in prior devices, the only method of arriving at proper adjustment is by trial and error because there is no visual indicator of the actual force being applied by the individual fingers. Also, with the use of spring fingers alone, if the stacks of bricks are too narrow, the fingers may entirely miss contact with the stack. This invention eliminates this problem also.

Other objects of the invention can be understood by referring to the accompanying drawings in which FIG. l shows a simplified diagrammatic top plan view of a preferred embodiment of a machine employing the features of this invention;

FIG. 2 shows a stack of bricks in a strapped form as assemblcd by the machine of FIG. 1;

FIG. 3 shows a side elevation View, in partial section, of the stack ejection mechanism;

FIG. 4 is la side elevation of a brick stacking jig and its related support mechanism;

FIG. 4a is a sectional view along the line 4rz 4a of FIG. 4;

FIG. 5 shows a sectional view along the line 5 5 of FIG. 3 and shows internal portions of the stack ejection mechanism;

FIG. 6 shows a sectional view along the line 6 6 of FIG. 3;

FIG. 7 shows :a sectional view along the line 7 7 of FIG. 3;

FIG. 8 shows a side elevation view of the stack compression station and the strapping station;

FIG. 9 shows an end view of the compression station as viewed along the line 9 9 of FIG. 8;

FIG. 10 shows a side elevation view in partial section of the portion of the compression station containing the compression fingers;

FIG. 11 is a left side elevation view of the portions of the compression station shown in FIG. l0; and

FIG. 12 shows a sectional view along the line 12 12 of FIG. 10.

The basic components of the invention as shown in FIG. 1 are the jig conveyor unit 1, the stacking jigs 2 carried by it, the stack ejector 3, the compression station 4, the strapping station 5 and the exit conveyor 6.

The jig conveyor unit 1 is composed of a sturdy Overhead support frame 7 which is provided with a continuous loop of I-beam shaped rail 7a (FIG. 1, 3, 4) which guide oppositely facing guide rollers 7b rotatably mounted on hangers 7c from which the stacking jigs 2 are suspended. This general type structure is shown in U.S. Patent 3,095,678, issued July 2, 1963 to G. J. Cliff etal., herein previously referred to. There are two of these hangers 7c for each jig and a continuous chain 7d is connected to these hangers in a continuous loop following the looped shape of the frame 7. As the chain 7 is driven by suitable power means, these stacking jigs 2 follow the path of the loop of the frame 1 with intermittent motion so that successive loaded stacking jigs 2 align between the stack ejector 3 and the compression station 4. This intermittent motion also aligns successive stacking jigs 2 with certain backing plates 8 rigidly mounted adjacent certain of the loading regions of the frame 7. A suitable power means for this intermittent motion is shown in said U.S. Patent 3,095,678.

By employing this intermittent motion, the individual stacking jigs 2, as they follow their looped path, stop in front of the backing plates 8 where they are loaded with bricks. The vbacking plates 8 insure that the bricks stack evenly on the stacking jigs with no overhang of any of the ybricks relative to others in each stack. After they pass these backing plate stations, the stacking jigs 2. intermittently stop, as mentioned, between the stack ejector 3 and the compression station 4. The stack ejector 3 then causes the stack of bricks on the stacking jig positioned between the stack ejector 3 and the compression station 4 to be ejected from its stacking jig 2 and moved to the compression station 4. The stack ejector is employed to both eject the stack and to compress the ejected stack against other leading stacks which have been previously ejected. This causes them to be pressed tightly against each other and moved forward along the compression station 4 and finally to the strapping station 5 where straps are encircled and secured around the stacks.

In more detail, each stacking jig 2, when it reaches a backing plate 8, as shown in FIG. 4, swings toward the backing plate 8 by gravity. This is accomplished by means of rollers 9 projecting from the bottom of each stacking jig 2 which are guided along a lower rail 10 (FIGS. 4 and 4a). This movement by gravity occurs by having the stacking jigs ordinarily sloped at a slight angle as they ordinarily are guided along the lower rail 10 which is provided with two detents 11 into which the rollers 9 drop as a stacking jig 2 arrives at a station in alignment with a backing plate S. This guarantees that each stacking jig 2 bears its full back area flush against a backing plate 8. In this manner, when the 'bricks B are stacked in the stacking jig 2, they all align evenly with the surface of a backing plate 8. In order to insure that the bricks B will not scrape unnecessarily against a backing plate 8 when a loaded stacking jig moves away from a backing plate during the intermittent motion of the conveyor unit 1, the rollers 9 roll up the deteuts 11 and cam the stacking jig away from the backing plate 8. Even though the trailing roller of the two rollers 9 of a single stacking jig will pass by the leading detent 11 as a stacking "g moves, the leading roller 9 bearing along the straight portion of the lower rail 10 will prevent it from dropping into the leading detent 11. These backing plates 8 are provided at as many stacking stations of the jigs as conveniently possible along the entire path of the loop of the conveyor unit 1. This enables Workers to be stationed around the conveyor unit loop and participate in the loading of all of the stacking jigs 2 by having workers place a certain number of bricks in each of the stacking jigs 2. By the time the last stacking station is reached, a stacking jig will be full.

The stack ejector 3, as shown in FIGS. 1, 3, 6 and 7 consists of a skeletal box-shaped frame 11 provided with two inverted, V-shaped rails 12 and 13 along which are guided four wheels 14. These wheels 14 are journaled on shafts 14a secured to a cylinder support frame 15. The frame 11 is provided with a transverse support 16 having two vertically extending pivot plates 17 on which the leading end 18a of a fluid cylinder 18` is pivoted by means of pivot pins 18h. The rear end 18C of the cylinder 18 is unsupported.

The cylinder 18 -houses a piston 19 connected to a piston rod 19a. The leading end 19b of the piston rod 19a is journaled by a pin 20 to a connector 21 joined to a front wall 15a of the cylinder support frame 15. This wall 15a is provided with four horizontal extending rails 22 which extend well beyond the front wall 15a. At the far ends of these rails 22 is a flat plate 23 which provides the surface for reacting Iagainst the bricks to eject them from a. stacking jig 2. Adjacent to the fiat plate 23 is an auxiliary plate 23a which is removably mounted to the supporting structure for the at plate 23 which functions as an extension of the flat plate 23 to accommodate brick stacks of different widths and it can be of any suitable width depending upon the width ofthe particular brick stack to be ejected. It can be bolted to the supporting structure or provided with a common quick release mechanism.

In order to provide stacks of bricks B of different widths, each stacking jig 2 is provided with a movable wall 2a (FIG. 4) which is secured to the base 2b and an upper support 2c of each stacking jig 2 by means of bolts 2d. A multiple number of holes are Provided along each of the members 2b and 2c so that the wall 2a can 'be positioned at different width spacings from the opposite wall 2e of the stacking jig 2.

When the stack ejector 3 causes a stack of bricks B to be ejected from a stacking jig 2 and into the compression station 4, the stacks `of bricks ahead of he particular stack being ejected are urged through the compression station 4. This compression station 4 is similar in many respects to the compression station in said U.S. Patent 3,095,678 except that it embodies improvements over what is there shown.

The construction of the compression station 4 is particularly shown in FIGS. 8-12 where it is supported by a hollow structural frame 24. This frame 24 has two overhead horizontal rails 25 on which four grooved rollers 26 are guided for movement transversely of the frame 24. These four rollers 26 are supported on shafts 27 which are journaled to the upper end of a spring finger support frame 28. Mounted to guide along the lower surface of plates mounted below the guide rails 25 Iare additional rollers 29 which, together with the rollers 26, keep the frame 28 from vertical movement. This frame 28 has supporting structure 28a on its forward face which supports a plurality of fingers 30. Each of these fingers is pivoted on a shaft 31 to the supporting structure 28a and each is biased by a spring 32 connected between an end 30a of each linger 30 and an adjustable shaft 32a. At the free ends of each of the fingers 30 are journaled rollers 33 and the bias of the springs 32 urges the fingers 30 in a direction to move the rollers 33 into the path of a stack of bricks passing through the compression station 4. The spring finger support frame 28 is provided at its rear surface with a pivot 34 connected to the leading end 35 of a piston rod 36 connected to a piston 37 in a cylinder 38. Suitable fluid pressure applied to the piston 37 urges the support frame 28 and the rollers 33 on the fingers 30 in a direction toward the sides of stacks of bricks passing through the compression station 4. The rolling action of the rollers 26 and 29 permits the spring linger support frame 28 to be shifted toward the brick stacks by the force of the piston 37.

Opposite the position of the spring lingers 30 on the support frame 28 is a wall of rollers 39 journaled along the upper half of the area. These rollers 39 and the rollers 33 allow movement of the brick stacks through the compression station 4 without any scraping action.

The principal purpose of these spring fingers 30 is to assist in compacting the stacks of bricks so that all of the bricks in a stack are compressed tightly toward each other transversely. They also provide a degree of drag of a stack as it passes through the compression station 4 and this causes the stacks to be drawn together tightly longtiudinally of the movement of the stacks through the compression station 4, the rollers 33 preventing the iingers 30 from dragging along the sides of the st-acks and scraping the bricks. Also, at the separation between one row of bricks and another, if there is any step, the lingers snap down or up over the step and, without the rollers, would damage the bricks. The rollers provide a rolling action without any harmful quick snapping action of the lingers 30.

Whereas, on prior devices, proper adjustment of finger pressure was required for each individual finger and, if the stack was too narrow, the fingers might not touch it at all. By the improved device of this invention, the support frame 28 is movable by means of the force of the piston 37 so that the rollers 33 can be urged against all brick stacks, regardless of width. Further, uniform pressures can be applied by means of the piston 37, even though there has been no change in t-he adjustment of the individual springs 32 biasing the fingers 30. Also, it is possible to preset the operating fluid pressure of the cylinder 38 in advance to provide the desired pressure of the rollers 33 against the brick stacks, and the pressure against the individual stacks will be the same regardless of stack width. The device compensates for stack Width by more or less travel of the support frame 28. In fact, once set, it is unlikely that any further adjustment of the springs 32 will be required.

As the stacks pass through the compression station, they are fed with corner protector strips C at the four corners of the stacks by applying means clearly shown in said Patents 3,095,678 and 3,003,296. Further, as each of the stacks reaches the strapping station 5, an automatic strapping machine 40 can apply a strap loop 41 around each of the stacks, or suitable strapping equipment as indicated in Said patents can be employed, all of which strapping equipment is well known and available for purchase. A typical strapped stack of bricks B is indicated in FIG. 2 with an encircling strap 42 around it. The corner protector strips C are applied continuously and link one stack of bricks B with the stacks behind it. As a suiiicient number of linked stacks is obtained, the corner protector strips C are severed by suitable Imeans to separate a unit of four or iive or more or less stacks from the remaining stacks and such a group of stacks 42 is then shifted to the exit conveyor 6 where it is removed for shipment or storage.

As shown in FIGS. 9, l0 and 12, the leading row of lingers 30 at the compression station 4 have rollers 33 which extend forward of the strap guide so that rollers 33 are positioned to bear against the bricks of a stack on both sides of the region of a stack where an encircling binder strap is to be applied when the stack is in the strapping station 5. This insures that the bricks of a stack are compacted laterally and held in their compacted positions until after an encircling binder strap is applied. With prior devices, all compacting was achieved ahead of the strapping station with the result that the bricks would tend to fan open as they would leave the compression station and enter the strapping station. By having the compression means extending far enough, as described, this fanning out of the bricks is eliminated and tight and orderly packages of bricks or other objects can be obtaine-d.

The cylinders 18 and 38 can be provided with fluid for actuation from a suitable power source, not shown, which can be automatically sequenced to operate in timed relationship with the intermittent motion of the conveyor unit 1, or else provided with suitable manual controls for manually operating these devices when necessary. It should also be mentioned that the compression station 4, the strapping station 5, and the exit conveyor 6 are all provided with freely journaled support rollers 43 which allow the brick stacks to freely roll through these stations. Also, adjacent the exit conveyor l6 can be mounted another cylinder 44 having a piston rod 45 connected to an L- shaped frame 46 for ejecting the brick stacks.

It should be evident that the major advantages of this invention relate to the improved stacking arrangement involving the backing plates 8 as simple means for insuring that the bricks are stacked along an even facing without any of the bricks projecting or overhanging others. Further, the stack ejector 3 has a ilat plate which bears against an entire area of the brick stack to insure that the bricks remain in their straight alignment during ejecting. In addition, this improved stacking and ejecting means insures mini-mum damage to the bricks. Also, the improved spring finger arrangement guarantees good compacting of the bricks and the stacks of bricks with minimum damage to the bricks and with minimum, if any, need for adjustment when the brick stack widths vary.

We claim:

1. An article packaging machine comprising, a conveyor along which stacks of articles are to be advanced,

means for delivering loose stacks of said articles to one end of the conveyor and for advancing previously delivered stacks along the conveyor by each successive stack as the latter is delivered to the conveyor, a wall extending vertically from adjacent one side of said conveyor, cornpacting means positioned adjacent one side of said conveyor, compacting means positioned adjacent the opposite side of the conveyor operative for engaging the articles at the same adjacent side of a stack to compact the articles of the stacks in movement relative to said wall as the stacks are advanced along said conveyor to eliminate spaces between the articles, and power means applied to the compacting means for varying the degree of force applied for compacting and for varying the compacting movement of said compacting means, said compacting means having a plurality of spring loaded fingers positioned adjacent said opposite side of the conveyor and collectively operative to compact the articles of the stacks relative to said wall as the stacks are advanced along the conveyor to eliminate spaces between the articles, said spring loaded fingers having freely rotatable rollers journaled at their free ends for providing rolling contact of the fingers during their engagement with the articles of the stacks.

2. An article packaging machine comprising, a conveyor along which stacks of articles are to be advanced, means for delivering loose stacks of said articles to one end of the conveyor and for advancing previously delivered stacks along the conveyor by each successive stack as the latter is delivered to the conveyor, a compacting station along the conveyor, a pair of oppositely positioned walls with one wall of the pair located on an opposite side of the conveyor, at least 4one wall being movable relative to the other wall for causing the articles to be contacted by the walls and compacted between them as the stacks are advanced along the conveyor to eliminate spaces between the articles, and power means connected to said movable wall to cause its movement, at least one of said walls having a plurality of spring loaded fingers collectively oper-ative to bear against the articles of the stacks advanced between the walls, said spring loaded lingers being provided with freely rotatable rollers journaled at their free ends for providing rolling contact of the fingers during their engagement with the articles of the stacks.

3. An article packaging machine comprising, a conveyor along which stacks of articles are to be advanced, means for delivering loose stacks of said articles to one end of the conveyor and for advancing previously delivered stacks along the conveyor by each successive stack as the latter is delivered to the conveyor, a compacting station along the conveyor, a pair of oppositely positioned walls with one wall of the pair located on an opposite side of the conveyor, at least one wall being movable relative to the other wall for causing the articles to be contacted by the walls and compacted between them as the stacks are advanced along the conveyor to eliminate spaces between the articles, and power means connected to said movable wall to cause its movement, a strapping station along the conveyor located to overlap the compacting station and adapted to permit a loop of lstrap to be encircled and bound around a stack of articles at the compacting station while it is being compacted by said pair of walls at the compacting station.

4. An article packaging machine comprising, a conveyor along which stacks of articles are to be advanced,

means for delivering loose stacks of said articles to one end of the conveyor and for advancing previously delivered stacks along the conveyor by each successive stack as the latter is delivered to the conveyor, a compacting station along the conveyor, a pair of oppositely positioned walls with one wall of the pair located on an opposite side of the conveyor, at least one wall being movable relative to the other wall for causing the articles to be contacted by the walls and compacted between them as the stacks are advanced along the conveyor to eliminate spaces between the articles, and power means connected to said movable Wall to cause its movement, a strapping station along the conveyor to overlap the compacting station, said strapping station having guide means for encircling a strap loop around a stack of articles, said guide means being located within the region of the compacting station so that a stack of articles being encircled with a strap loop is simultaneously held compacted within the compacting region of the compacting station.

5. An article packaging machine comprising, a rst conveyor provided with spaced jigs for receiving a plurality of articles in a given loosely stacked arrangement, said first conveyor following an endless path past a number of loading stations at each of which a desired number of articles are placed on each jig to progressively build a complete stack on each jig, an unloading station along the endless path of the iirst conveyor at a location beyond the last loading station, ejection means at the unloading station for ejecting a stack of articles from a jig located at the unloading station, a second conveyor located at the unloading station for receiving stacks of articles ejected from the jigs, said ejecting means advancing previously delivered stacks along the second conveyor byeach successive stack as the latter is delivered to the second conveyor, a compacting station along the second conveyor, a pair of oppositely positioned walls with one wall of the pair located on an opposite side of the second conveyor, at least one wall being movable relative to the other wall for causing the articles to be contacted by the walls and compacted between them as the stacks are advanced along the second conveyor to eliminate spaces between the articles, and power means connected to said movable wall to cause its movement, a strapping station along the second conveyor located to overlap the compacting station, said strapping station having guide means for encircling a strap loop around a stack of articles, said guide means being located within the region of the compacting station so that a stack of articles being encircled with a strap loop is simultaneously held compacted within the compacting region of the compacting station.

References Cited UNITED STATES PATENTS 1,100,592 6/1914 Madden.

2,470,278 5/ 1949 West et al 100-191 2,565,952 8/1951 Curran et a1. 100--211 XR 2,763,201 9/ 1956 Hauswirth 100--191 XR 2,933,207 4/ 1960 Edmonds et al 214-6 2,961,810 11/1960 Johnson et al. 53--26 3,003,296 10/ 1961 Feldkamp et al 53-26 3,095,678 7/ 1963 Cliff et al. 53-124 3,117,513 1/1964 Burnett et al. 10G-218 XR BILLY I. WILHITE, Primary Examiner. 

